make

    ./example example_files/alaw.raw alaw_pcm ulaw_to_pcm.audio
    ./example example_files/ulaw.raw ulaw_pcm alaw_to_pcm.audio
    ./example example_files/pcm.raw pcm_alaw pcm_to_alaw.audio
    ./example example_files/pcm.raw pcm_ulaw pcm_to_ulaw.audio

    brew install sox

    play -t s16 -r 44100 -c 2 -e signed-integer example_files/pcm.raw
    play -t raw -r 44100 -c 2 -e a-law example_files/alaw.raw
    play -t raw -r 44100 -c 2 -e u-law example_files/ulaw.raw

    play -t s16 -r 44100 -c 2 -e signed-integer alaw_to_pcm.audio
    play -t s16 -r 44100 -c 2 -e signed-integer ulaw_to_pcm.audio
    play -t raw -r 44100 -c 2 -e a-law          pcm_to_alaw.audio
    play -t raw -r 44100 -c 2 -e u-law          pcm_to_ulaw.audio